zoneminder/src/zm_event.cpp

//
// ZoneMinder Event Class Implementation, $Date$, $Revision$
// Copyright (C) 2003, 2004, 2005, 2006  Philip Coombes
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 

#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <getopt.h>
#include <glob.h>

#include "zm.h"
#include "zm_db.h"
#include "zm_mpeg.h"
#include "zm_event.h"
#include "zm_monitor.h"

#include "zmf.h"

bool Event::initialised = false;
char Event::capture_file_format[PATH_MAX];
char Event::analyse_file_format[PATH_MAX];
char Event::general_file_format[PATH_MAX];

int Event::pre_alarm_count = 0;
Event::PreAlarmData Event::pre_alarm_data[MAX_PRE_ALARM_FRAMES] = { 0 };

Event::Event( Monitor *p_monitor, struct timeval p_start_time, const char *p_cause, const char *p_text ) : monitor( p_monitor ), start_time( p_start_time )
{
    if ( !initialised )
        Initialise();

    strncpy( cause, p_cause, sizeof(cause) );
    strncpy( text, p_text, sizeof(text) );

    static char sql[BUFSIZ];
    static char start_time_str[32];

    strftime( start_time_str, sizeof(start_time_str), "%Y-%m-%d %H:%M:%S", localtime( &start_time.tv_sec ) );
    snprintf( sql, sizeof(sql), "insert into Events ( MonitorId, Name, StartTime, Width, Height, Cause, Notes ) values ( %d, 'New Event', '%s', %d, %d, '%s', '%s' )", monitor->Id(), start_time_str, monitor->Width(), monitor->Height(), cause, text );
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't insert event: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }
    id = mysql_insert_id( &dbconn );
    end_time.tv_sec = 0;
    frames = 0;
    alarm_frames = 0;
    tot_score = 0;
    max_score = 0;
    snprintf( path, sizeof(path), "%s/%d/%d", config.dir_events, monitor->Id(), id );
    
    struct stat statbuf;
    errno = 0;
    stat( path, &statbuf );
    if ( errno == ENOENT || errno == ENOTDIR )
    {
        if ( mkdir( path, 0755 ) )
        {
            Error(( "Can't make %s: %s", path, strerror(errno)));
        }
    }

    last_db_frame = 0;
}

Event::~Event()
{
    if ( frames > last_db_frame )
    {
        struct DeltaTimeval delta_time;
        DELTA_TIMEVAL( delta_time, end_time, start_time, DT_PREC_2 );

        Debug( 1, ( "Adding closing frame %d to DB", frames ));
        static char sql[BUFSIZ];
        snprintf( sql, sizeof(sql), "insert into Frames ( EventId, FrameId, TimeStamp, Delta ) values ( %d, %d, from_unixtime( %d ), %s%ld.%02ld )", id, frames, end_time.tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec );
        if ( mysql_query( &dbconn, sql ) )
        {
            Error(( "Can't insert frame: %s", mysql_error( &dbconn ) ));
            exit( mysql_errno( &dbconn ) );
        }
    }

    static char sql[BUFSIZ];
    static char end_time_str[32];

    struct DeltaTimeval delta_time;
    DELTA_TIMEVAL( delta_time, end_time, start_time, DT_PREC_2 );

    strftime( end_time_str, sizeof(end_time_str), "%Y-%m-%d %H:%M:%S", localtime( &end_time.tv_sec ) );

    snprintf( sql, sizeof(sql), "update Events set Name='%s%d', EndTime = '%s', Length = %s%ld.%02ld, Frames = %d, AlarmFrames = %d, TotScore = %d, AvgScore = %d, MaxScore = %d where Id = %d", monitor->EventPrefix(), id, end_time_str, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec, frames, alarm_frames, tot_score, (int)(alarm_frames?(tot_score/alarm_frames):0), max_score, id );
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't update event: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }
}

int Event::sd = -1;

bool Event::OpenFrameSocket( int monitor_id )
{
    if ( sd > 0 )
    {
        close( sd );
    }

    sd = socket( AF_UNIX, SOCK_STREAM, 0);
    if ( sd < 0 )
    {
        Error(( "Can't create socket: %s", strerror(errno) ));
        return( false );
    }

    int socket_buffer_size = config.frame_socket_size;
    if ( socket_buffer_size > 0 )
    {
        if ( setsockopt( sd, SOL_SOCKET, SO_SNDBUF, &socket_buffer_size, sizeof(socket_buffer_size) ) < 0 )
        {
            Error(( "Can't get socket buffer size to %d, error = %s", socket_buffer_size, strerror(errno) ));
            close( sd );
            sd = -1;
            return( false );
        }
    }

    int flags;
    if ( (flags = fcntl( sd, F_GETFL )) < 0 )
    {
        Error(( "Can't get socket flags, error = %s", strerror(errno) ));
        close( sd );
        sd = -1;
        return( false );
    }
    flags |= O_NONBLOCK;
    if ( fcntl( sd, F_SETFL, flags ) < 0 )
    {
        Error(( "Can't set socket flags, error = %s", strerror(errno) ));
        close( sd );
        sd = -1;
        return( false );
    }

    char sock_path[PATH_MAX] = "";
    snprintf( sock_path, sizeof(sock_path), "%s/zmf-%d.sock", config.path_socks, monitor_id );

    struct sockaddr_un addr;

    strncpy( addr.sun_path, sock_path, sizeof(addr.sun_path) );
    addr.sun_family = AF_UNIX;

    if ( connect( sd, (struct sockaddr *)&addr, strlen(addr.sun_path)+sizeof(addr.sun_family)) < 0 )
    {
        Warning(( "Can't connect to frame server: %s", strerror(errno) ));
        close( sd );
        sd = -1;
        return( false );
    }

    Debug( 1, ( "Opened connection to frame server" ));
    return( true );
}

bool Event::ValidateFrameSocket( int monitor_id )
{
    if ( sd < 0 )
    {
        return( OpenFrameSocket( monitor_id ) );
    }
    return( true );
}

bool Event::SendFrameImage( const Image *image, bool alarm_frame )
{
    if ( !ValidateFrameSocket( monitor->Id() ) )
    {
        return( false );
    }

    static int jpg_buffer_size = 0;
    static unsigned char jpg_buffer[ZM_MAX_IMAGE_SIZE];

    image->EncodeJpeg( jpg_buffer, &jpg_buffer_size, config.jpeg_file_quality );

    static FrameHeader frame_header;

    frame_header.event_id = id;
    frame_header.frame_id = frames;
    frame_header.alarm_frame = alarm_frame;
    frame_header.image_length = jpg_buffer_size;

    struct iovec iovecs[2];
    iovecs[0].iov_base = &frame_header;
    iovecs[0].iov_len = sizeof(frame_header);
    iovecs[1].iov_base = jpg_buffer;
    iovecs[1].iov_len = jpg_buffer_size;

    ssize_t writev_size = sizeof(frame_header)+jpg_buffer_size;
    ssize_t writev_result = writev( sd, iovecs, sizeof(iovecs)/sizeof(*iovecs));
    if ( writev_result != writev_size )
    {
        if ( writev_result < 0 )
        {
            if ( errno == EAGAIN )
            {
                Warning(( "Blocking write detected" ));
            }
            else
            {
                Error(( "Can't write frame: %s", strerror(errno) ));
                close( sd );
                sd = -1;
            }
        }
        else
        {
            Error(( "Incomplete frame write: %d of %d bytes written", writev_result, writev_size ));
            close( sd );
            sd = -1;
        }
        return( false );
    }
    Debug( 1, ( "Wrote frame image, %d bytes", jpg_buffer_size ));

    return( true );
}

bool Event::WriteFrameImage( Image *image, struct timeval timestamp, const char *event_file, bool alarm_frame )
{
    if ( config.timestamp_on_capture )
    {
        if ( !config.opt_frame_server || !SendFrameImage( image, alarm_frame) )
        {
            image->WriteJpeg( event_file );
        }
    }
    else
    {
        Image ts_image( *image );
        monitor->TimestampImage( &ts_image, timestamp.tv_sec );
        if ( !config.opt_frame_server || !SendFrameImage( &ts_image, alarm_frame) )
        {
            ts_image.WriteJpeg( event_file );
        }
    }
    return( true );
}

void Event::AddFrames( int n_frames, Image **images, struct timeval **timestamps )
{
    static char sql[BUFSIZ];
    strncpy( sql, "insert into Frames ( EventId, FrameId, TimeStamp, Delta ) values ", BUFSIZ );
    for ( int i = 0; i < n_frames; i++ )
    {
        frames++;

        static char event_file[PATH_MAX];
        snprintf( event_file, sizeof(event_file), capture_file_format, path, frames );
        
        Debug( 1, ( "Writing pre-capture frame %d", frames ));
        WriteFrameImage( images[i], *(timestamps[i]), event_file );

        struct DeltaTimeval delta_time;
        DELTA_TIMEVAL( delta_time, *(timestamps[i]), start_time, DT_PREC_2 );

        int sql_len = strlen(sql);
        snprintf( sql+sql_len, sizeof(sql)-sql_len, "( %d, %d, from_unixtime(%d), %s%ld.%02ld ), ", id, frames, timestamps[i]->tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec );
    }

    Debug( 1, ( "Adding %d frames to DB", n_frames ));
    *(sql+strlen(sql)-2) = '\0';
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't insert frames: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    last_db_frame = frames;
}

void Event::AddFrame( Image *image, struct timeval timestamp, int score, Image *alarm_image )
{
    frames++;

    static char event_file[PATH_MAX];
    snprintf( event_file, sizeof(event_file), capture_file_format, path, frames );
        
    Debug( 1, ( "Writing capture frame %d", frames ));
    WriteFrameImage( image, timestamp, event_file );

    struct DeltaTimeval delta_time;
    DELTA_TIMEVAL( delta_time, timestamp, start_time, DT_PREC_2 );

    bool db_frame = (score>=0) || ((frames%config.bulk_frame_interval)==0) || !frames;

    if ( db_frame )
    {
        const char *frame_type = score>0?"Alarm":(score<0?"Bulk":"Normal");

        Debug( 1, ( "Adding frame %d to DB", frames ));
        static char sql[BUFSIZ];
        snprintf( sql, sizeof(sql), "insert into Frames ( EventId, FrameId, Type, TimeStamp, Delta, Score ) values ( %d, %d, '%s', from_unixtime( %d ), %s%ld.%02ld, %d )", id, frames, frame_type, timestamp.tv_sec, delta_time.positive?"":"-", delta_time.sec, delta_time.fsec, score );
        if ( mysql_query( &dbconn, sql ) )
        {
            Error(( "Can't insert frame: %s", mysql_error( &dbconn ) ));
            exit( mysql_errno( &dbconn ) );
        }
        last_db_frame = frames;

        // We are writing a bulk frame
        if ( score < 0 )
        {
            snprintf( sql, sizeof(sql), "update Events set Length = %s%ld.%02ld, Frames = %d, AlarmFrames = %d, TotScore = %d, AvgScore = %d, MaxScore = %d where Id = %d", delta_time.positive?"":"-", delta_time.sec, delta_time.fsec, frames, alarm_frames, tot_score, (int)(alarm_frames?(tot_score/alarm_frames):0), max_score, id );
            if ( mysql_query( &dbconn, sql ) )
            {
                Error(( "Can't update event: %s", mysql_error( &dbconn ) ));
                exit( mysql_errno( &dbconn ) );
            }
        }
    }

    if ( score > 0 )
    {
        end_time = timestamp;

        alarm_frames++;

        tot_score += score;
        if ( score > max_score )
            max_score = score;

        if ( alarm_image )
        {
            snprintf( event_file, sizeof(event_file), analyse_file_format, path, frames );

            Debug( 1, ( "Writing analysis frame %d", frames ));
            WriteFrameImage( alarm_image, timestamp, event_file, true );
        }
    }

    if ( config.record_diag_images )
    {
        char diag_glob[PATH_MAX] = "";

        snprintf( diag_glob, sizeof(diag_glob), "%s/%d/diag-*.jpg", config.dir_events, monitor->Id() );
        glob_t pglob;
        int glob_status = glob( diag_glob, 0, 0, &pglob );
        if ( glob_status != 0 )
        {
            if ( glob_status < 0 )
            {
                Error(( "Can't glob '%s': %s", diag_glob, strerror(errno) ));
            }
            else
            {
                Debug( 1, ( "Can't glob '%s': %d", diag_glob, glob_status ));
            }
        }
        else
        {
            char new_diag_path[PATH_MAX] = "";
            for ( int i = 0; i < pglob.gl_pathc; i++ )
            {
                char *diag_path = pglob.gl_pathv[i];

                char *diag_file = strstr( diag_path, "diag-" );

                if ( diag_file )
                {
                    snprintf( new_diag_path, sizeof(new_diag_path), general_file_format, path, frames, diag_file );

                    if ( rename( diag_path, new_diag_path ) < 0 )
                    {
                        Error(( "Can't rename '%s' to '%s': %s", diag_path, new_diag_path, strerror(errno) ));
                    }
                }
            }
        }
        globfree( &pglob );
    }
}

void Event::StreamEvent( int event_id, int frame_id, int scale, int rate, int maxfps )
{
    static char sql[BUFSIZ];
    static char eventpath[PATH_MAX];
    
    if ( !initialised )
        Initialise();

    snprintf( sql, sizeof(sql), "select M.Id, M.Name, E.Frames, max(F.Delta)-min(F.Delta) as Duration from Events as E inner join Monitors as M on E.MonitorId = M.Id inner join Frames as F on E.Id = F.EventId where E.Id = %d group by E.Id", event_id );
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't run query: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    MYSQL_RES *result = mysql_store_result( &dbconn );
    if ( !result )
    {
        Error(( "Can't use query result: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }
    MYSQL_ROW dbrow = mysql_fetch_row( result );

    if ( mysql_errno( &dbconn ) )
    {
        Error(( "Can't fetch row: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    snprintf( eventpath, sizeof(eventpath), "%s/%s/%d/%d", ZM_PATH_WEB, config.dir_events, atoi( dbrow[0] ), event_id );
    int frames = atoi(dbrow[2]);
    double duration = atof(dbrow[3]);

    int min_fps = 1;
    int max_fps = maxfps;
    int base_fps = (int)((double)frames/duration);
    int effective_fps = (base_fps*rate)/ZM_RATE_SCALE;

    int frame_mod = 1;
    // Min frame repeat?
    while( effective_fps > max_fps )
    {
        effective_fps /= 2;
        frame_mod *= 2; 
    }

    Debug( 1, ( "Frames:%d, Duration: %.2f, BFPS:%d, EFPS:%d, FM:%d", frames, duration, base_fps, effective_fps, frame_mod ));

    mysql_free_result( result );

    snprintf( sql, sizeof(sql), "select FrameId, EventId, Delta from Frames where EventId = %d and FrameId >= %d order by FrameId", event_id, frame_id );
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't run query: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    result = mysql_store_result( &dbconn );
    if ( !result )
    {
        Error(( "Can't use query result: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    fprintf( stdout, "Content-Type: multipart/x-mixed-replace;boundary=ZoneMinderFrame\r\n\r\n" );

    FILE *fdj = NULL;
    int n_bytes = 0;
    int id = frame_id, db_id, last_db_id = 0;
    double base_delta, last_delta = 0.0L;
    double db_delta, last_db_delta = 0.0L;
    unsigned int delta_us =0;
    static unsigned char buffer[ZM_MAX_IMAGE_SIZE];
    while( (id <= frames) && (dbrow = mysql_fetch_row( result )) )
    {
        if ( id == frame_id )
        {
            base_delta = atof(dbrow[2]);
        }

        db_id = atoi( dbrow[0] );
        db_delta = atof( dbrow[2] )-base_delta;
        bool db_written = false;
        while( db_id >= id )
        {
            if ( (frame_mod == 1) || (((id-1)%frame_mod) == 0) )
            {
                double this_delta = last_db_delta+(((id-last_db_id)*(db_delta-last_db_delta))/(db_id-last_db_id));
                if (this_delta > last_delta)
                    delta_us = (unsigned int)((this_delta-last_delta) * 1000000);
                else
                    delta_us = 0;

                if ( rate != ZM_RATE_SCALE )
                    delta_us = (delta_us*ZM_RATE_SCALE)/rate;
                Debug( 2, ( "I:%d, DI:%d, LDBI:%d, DD:%lf, LD:%lf, LDBD:%lf, TD:%lf, DU:%d", id, db_id, last_db_id, db_delta, last_delta, last_db_delta, this_delta, delta_us ));

                static char filepath[PATH_MAX];
                snprintf( filepath, sizeof(filepath), capture_file_format, eventpath, id );

                if ( scale == 100 )
                {
                    if ( (fdj = fopen( filepath, "r" )) )
                    {
                        n_bytes = fread( buffer, 1, sizeof(buffer), fdj );
                        fclose( fdj );
                    }
                    else
                    {
                        Error(( "Can't open %s: %s", filepath, strerror(errno) ));
                    }
                }
                else
                {
                    Image image( filepath );

                    image.Scale( scale );

                    image.EncodeJpeg( buffer, &n_bytes );
                }
                fprintf( stdout, "--ZoneMinderFrame\r\n" );
                fprintf( stdout, "Content-Length: %d\r\n", n_bytes );
                fprintf( stdout, "Content-Type: image/jpeg\r\n\r\n" );
                fwrite( buffer, n_bytes, 1, stdout );
                fprintf( stdout, "\r\n\r\n" );
                fflush( stdout );
                last_delta = this_delta;
                db_written = true;
                usleep( delta_us );
            }
            id++;
        }
        if ( db_written )
        {
            last_db_id = db_id;
            last_db_delta = db_delta;
        }
    }
    if ( mysql_errno( &dbconn ) )
    {
        Error(( "Can't fetch row: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }
    // Yadda yadda
    mysql_free_result( result );
}

#if HAVE_LIBAVCODEC     

void Event::StreamMpeg( int event_id, int frame_id, const char *format, int scale, int rate, int maxfps, int bitrate )
{
    static char sql[BUFSIZ];
    static char eventpath[PATH_MAX];
    
    if ( !initialised )
        Initialise();

    snprintf( sql, sizeof(sql), "select M.Id, M.Name, E.Frames, max(F.Delta)-min(F.Delta) as Duration from Events as E inner join Monitors as M on E.MonitorId = M.Id inner join Frames as F on E.Id = F.EventId where E.Id = %d group by E.Id", event_id );
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't run query: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    MYSQL_RES *result = mysql_store_result( &dbconn );
    if ( !result )
    {
        Error(( "Can't use query result: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }
    MYSQL_ROW dbrow = mysql_fetch_row( result );

    if ( mysql_errno( &dbconn ) )
    {
        Error(( "Can't fetch row: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    snprintf( eventpath, sizeof(eventpath), "%s/%s/%d/%d", ZM_PATH_WEB, config.dir_events, atoi( dbrow[0] ), event_id );
    int frames = atoi(dbrow[2]);
    double duration = atof(dbrow[3]);

    int min_fps = 1;
    int max_fps = maxfps;
    int base_fps = (int)((double)frames/duration);
    int effective_fps = (base_fps*rate)/ZM_RATE_SCALE;

    int frame_mod = 1;
    // Min frame repeat?
    while( effective_fps > max_fps )
    {
        effective_fps /= 2;
        frame_mod *= 2; 
    }

    Debug( 1, ( "Frames:%d, Duration: %.2f, BFPS:%d, EFPS:%d, FM:%d", frames, duration, base_fps, effective_fps, frame_mod ));

    mysql_free_result( result );

    snprintf( sql, sizeof(sql), "select FrameId, EventId, Delta from Frames where EventId = %d and FrameId >= %d order by FrameId", event_id, frame_id );
    if ( mysql_query( &dbconn, sql ) )
    {
        Error(( "Can't run query: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    result = mysql_store_result( &dbconn );
    if ( !result )
    {
        Error(( "Can't use query result: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }

    VideoStream *vid_stream = 0;
    int id = frame_id, last_id = 0;
    double base_delta, last_delta = 0.0L;
    unsigned int delta_ms =0;
    while( (id <= frames) && (dbrow = mysql_fetch_row( result )) )
    {
        if ( id == frame_id )
        {
            base_delta = last_delta = atof(dbrow[2]);
        }

        int db_id = atoi( dbrow[0] );
        double db_delta = atof( dbrow[2] )-base_delta;
        bool db_written = false;
        while( db_id >= id )
        {
            if ( (frame_mod == 1) || (((id-1)%frame_mod) == 0) )
            {
                static char filepath[PATH_MAX];
                snprintf( filepath, sizeof(filepath), capture_file_format, eventpath, id );

                Image image( filepath );

                if ( !vid_stream )
                {
                    vid_stream = new VideoStream( "pipe:", format, bitrate, effective_fps, image.Colours(), (image.Width()*scale)/ZM_SCALE_SCALE, (image.Height()*scale)/ZM_SCALE_SCALE );
                    fprintf( stdout, "Content-type: %s\r\n\r\n", vid_stream->MimeType() );
                    vid_stream->OpenStream();
                }

                if ( scale != 100 )
                {
                    image.Scale( scale );
                }

                double temp_delta = ((id-last_id)*(db_delta-last_delta))/(db_id-last_id);
                delta_ms = (unsigned int)((last_delta+temp_delta)*1000);
                if ( rate != ZM_RATE_SCALE )
                    delta_ms = (delta_ms*ZM_RATE_SCALE)/rate;
                double pts = vid_stream->EncodeFrame( image.Buffer(), image.Size(), config.mpeg_timed_frames, delta_ms );

                Debug( 2, ( "I:%d, DI:%d, LI:%d, DD:%lf, LD:%lf, TD:%lf, DM:%d, PTS:%lf", id, db_id, last_id, db_delta, last_delta, temp_delta, delta_ms, pts ));

                db_written = true;
            }
            id++;
        }
        if ( db_written )
        {
            last_id = db_id;
            last_delta = db_delta;
        }
    }
    if ( mysql_errno( &dbconn ) )
    {
        Error(( "Can't fetch row: %s", mysql_error( &dbconn ) ));
        exit( mysql_errno( &dbconn ) );
    }
    // Yadda yadda
    mysql_free_result( result );

    delete vid_stream;
}

#endif // HAVE_LIBAVCODEC